Raabid makes good points...

First, don't try a glow trainer on your own. An electric parkflyer is different.

I agree about RealFlight, I have it and use it extensively for practicing glow skills. However, I find it very ineffective for electrics. The one parkflyer I tried just doesn't feel right.

I used Cockpit Master Backyard Edition (and I may have already said that). Its not nearly as expensive as RealFlight. I have never used FMS.